The next release (coming out in the next week or two) will have a template feature. It may not be what you want, but in case it might meet your needs, I'll describe the new feature.
The new feature is "project templates". It allows you to set up your current project with a set of standard HTML, CSS, JS and images, then save that project as a "project template". Thereafter, you can create new projects from your project template.
To create standard left and top panels, you probably would want to create an HTML page that had a dojo BorderContainer as the top-level widget, and then set the options on BorderContainer to include left and top regions (but not right and bottom). Put standard content into the top and left regions, save that HTML file, then save the current project as a project template. Then create a new project (using that project template), open the HTML file, then be sure to Save As to a different name.
If you want to look at what's coming in the next release, you can download a nightly build from
http://maqetta.org/nightly. The nightly builds include the documentation, including a short tutorial on the upcoming project templates feature.
Jon Ferraiolo
Maqetta team